Toyota BZ Forum banner
1 - 18 of 18 Posts

· Registered
Joined
·
9 Posts
Discussion Starter · #1 ·
This stopped one day, I had to keep putting it on then it just stopped all together

Seeing Regenerative boost temporarily Unavailable See Owners manual

Looked in the owners manual on page 240 and all it really says is to apply the brakes and or that this will not work if this message is displayed.

Anyone have a fix for this or is this defective?
 

· Registered
Joined
·
26 Posts
the only time i had this was the few times i charged to 100% the charge generated via regen has to go into the battery if full regen was deactivated until approx. 90-95% SoC. If its not that you probably check in with the dealer. Good Luck!
 

· Registered
Joined
·
42 Posts
Mine has had this problem for the past two weeks, and it think it likely is reducing efficiency. If you take a look at Subaru Solterra forums, several folks have the same issue with that vehicle as well. I don't think a solution has yet been discovered, and the cause seems to be unknown, since it occurs even when when the battery is at a low state of charge—not just when it's fully or near fully charged.

I wonder if only vehicles with the CATL battery are having this problem..?
 

· Registered
Joined
·
9 Posts
Discussion Starter · #4 ·
Mine has had this problem for the past two weeks, and it think it likely is reducing efficiency. If you take a look at Subaru Solterra forums, several folks have the same issue with that vehicle as well. I don't think a solution has yet been discovered, and the cause seems to be unknown, since it occurs even when when the battery is at a low state of charge—not just when it's fully or near fully charged.

I wonder if only vehicles with the CATL battery are having this problem..?
Yeah this used to work at first, then it stopped working and I cannot figure out how to get this working again, the manual is not helpful at all, I cannot find any Toyota support for this so I have made an appointment with the dealership. Lol not a great start, less than a week old.
 

· Registered
Joined
·
9 Posts
Discussion Starter · #7 ·
A small update, as soon as I hit 260 mi mark I was then able to engage the 1 pedal regenerative boost mode. I don't think I ever saw that this will not engage if you are fully charged. ¯\(ツ)
 

· Registered
Joined
·
42 Posts
When you say 260 mile mark, do you mean 260 miles driven on a charge? So you were approaching 0% before it engaged?

I get that the boost won't activate if the battery is fully charged, or if the battery is cold, but even after half an hour of driving and <50% charge, I can't get it to activate for more than a couple of minutes.
 

· Registered
Joined
·
9 Posts
Discussion Starter · #9 ·
When you say 260 mile mark, do you mean 260 miles driven on a charge? So you were approaching 0% before it engaged?

I get that the boost won't activate if the battery is fully charged, or if the battery is cold, but even after half an hour of driving and <50% charge, I can't get it to activate for more than a couple of minutes.
At full charge it read 302mi, I was unable to activate the 1 pedal mode, as soon as I reached 260mi I was able to engage it. I wont be able to for sure test this as I am planning on using this charge session for about a week before charging it again, I will then do more tests and report back.

I will also keep in mind what you said and watch out for it.
 

· Registered
Joined
·
9 Posts
Discussion Starter · #11 ·
Update: When you hard brake or turn corners to hard this gets disabled. I found that if you turn on your EV, then hit the button it stays engaged till either you turn it off or hit the brakes to hard. I found that you can engage it if you are accelerating then you can engage it.
 

· Registered
Joined
·
9 Posts
Discussion Starter · #12 ·
OK after about a day, I can honestly say that this feature is rather pointless, I see no advantage in using this. With my hybrid, I could see the regenerative boost working on the batteries, with this I see no improvement, maybe you get 1-2 miles from a full charge, this also may save some brakes but otherwise not worth using. Its too picky and disables at odd times to be of any use so I have decided that I will no longer be activating it.
 

· Registered
2021 Ascent Limited; 2023 Bolt EUV Premier w/S&S, SC
Joined
·
45 Posts
My guess is that this is Toyota being super conservative and not allowing the battery to be "charged" (regen) at low temperatures. We need to get some feedback from someone in a warmer location to see if it is functional at higher temperatures. You didn't mention whether you have FWD or AWD, but I would assume AWD. I bet for someone with FWD in a warmer climate, it works great (as long as you're OK with the creep rather than a full stop).

EVERY post that has anything to do with charging, regen, battery should include information on battery version (FWD or AWD) and temperature.
 

· Registered
Joined
·
42 Posts
EVERY post that has anything to do with charging, regen, battery should include information on battery version (FWD or AWD) and temperature.
Agreed!

I'd always understood that regenerative braking was one of the key's to an EV or hybrid's efficiency, at least during around town driving. I just can't help but think that the fact that it doesn't seem to work properly on our vehicles—and usually just throws error messages when activated—might go a long way towards explaining their otherwise inexplicable poor efficiency.

Supposedly, these vehicles are capable of attaining sustained efficiency of 3.7-4.5+ miles/kWh—that's the only way they could possibly achieve their range claims (as per either EPA or WLTP ratings), and explain its best in class MPGe rating (i.e., vs. Ioniq 5, Mach-E, ID.4).

Considering that the BZ4X is also lighter in weight than some of its competition (Mach-E, ID.4 AWD), and has best in class aerodynamics (0.26 drag coefficient), it's low efficiency is similarly confounding. I thought this was the promise of its smaller battery relative to competitors—that it would still be competitive in its class, as far as range, due to its very high efficiency.

If the regeneration boost is this finicky and doesn't seem to stay on, it makes me question whether the standard/non-boosted blended brake pedal regeneration is working properly either, i.e., if there's even minimal recharge occurring with the 'boost' off. You can of course see energy supposedly being added to the battery on the dash display whenever you brake, even with regen boost off, but who knows if its actually occurring.

I think what we're up against is that Toyota wants absolutely minimal battery degradation, which is a noble goal, but that this goal is butting up against the vehicle's actual usability, i.e., as per charging speeds and range.
 

· Registered
Joined
·
14 Posts
US AWD, 20 to 40 F

I am in same boat - hardly ever can get regen boost to activate and the few times it has it deactivates within seconds. I would like the extra efficiency, but even moreso want the engine compression effect with AWD traction control when descending mountain passes in winter.

I am really holding out hope that the Toyota engineers can fix this and other issues like displaying SOC in the car with OTA updates ASAP. One doesn't like paying $50K+ for horatory features and unachievable range estimates for a vehicle model that has sold around the world for many months.
 

· Registered
2021 Ascent Limited; 2023 Bolt EUV Premier w/S&S, SC
Joined
·
45 Posts
US AWD, 20 to 40 F

I am in same boat - hardly ever can get region boost to activate and the few times it has it deactivates within seconds. I would like the extra efficiency, but even moreso want the engine compression effect with AWD traction control when descending mountain passes in winter.

I am really holding out hope that the Toyota engineers can fix this and other issues like displaying SOC in the car with OTA updates ASAP. One doesn't like paying $50K+ for horatory features and unachievable range estimates for a vehicle model that has sold around the world for many months.
I think they'll fix it, and if they don't, I would think it would be subject to recall. If you activate a setting that's supposed to slow down the car when you lift your foot and it doesn't, it can turn into a panic situation as you reach for the brake pedal and that can cause an accident. As @B.Wilkins_85 mentioned, too, Toyota really focused on battery degradation. Seems like the sourcing of the 72.8 kWh battery for AWD in NA came late in the process and they seem to be still testing it.
 

· Registered
Joined
·
9 Posts
Discussion Starter · #17 · (Edited)
I would just like to add that with the 1 pedal mode active, I saw maybe 10-20% of the bar fill up whereas not using it and applying the brake, I saw 80-90% being filled. It "looks" like this works out better using the brakes.
 

· Registered
Joined
·
129 Posts
I’m posting this, even though my vehicle is an AWD Solterra. This is just one more data point to go on the graph.

In my case, so far at least, S-Pedal has worked consistently 100% of the time…and I engage it each time I drive the vehicle. Granted, I only have a few hundred miles on the car. The outside temps in SC where I live have been ranging from freezing at night to the low 50-60’s range. Also, I have the charge maximum set to 80%, and have done minimal highway driving… 98% of my experience so far has been in-town driving.

I prefer the S-Pedal rather than using the steering wheel paddles simply due to its “set and forget” application.
 
1 - 18 of 18 Posts
Top